66 BULLETIN 97, UNITED STATES NATIONAL MUSEUM. 



WEST COAST SPECIES. 



HoJmesi, new species ?Monterey, California 



folitus Smith Peru ; Chile 



angelicus Lockington Gulf of California 



lithodomi Smith Panama 



uipunctatus Nicolet Chiloe $ 



muliniarum, new species_.Lower California $ 



puffcttcnsis Holmes Puget Sound ; British Columbia 



nudus Holmes Santa Cruz and Monterey, California- 



concharum (Rathbun) British Columbia to San Diego $ 



pubcscens (Holmes) Gulf of California 



silvestrii Nobili Chile 



margarita Smith La Paz ; Panama $ 



rcticulatus, new species Gulf of California 



taylori, new species British Columbia $ 



orcutti, new species Manzanillo $ 



Analogous species of Pinnotheres on opposite sides of the con- 

 tinent: ostreum (Atlantic); holmesi (Pacific). 



PINNOTHERES OSTREUM Say. 

 OYSTER CRAB. 

 Plate 15, figs. 3-6. 



t Pinnotheres pinnophylax Bosc, Hist. Nat. Crust., vol. 1, an X [1801-2], 

 p. 243 (part), not pi. 6, fig. 3 (after Herbst) nor Cancer pinnophylav 

 Herbst, 1783; coasts of America in Chuma lazarus (according to 

 Bosc). As this is a European species of Chama, C. macerophylla 

 Gmelin is doubtless the species indicated. 



Pinnotheres ostreum SAY, Journ. Acad. Nat. Sci. Philadelphia, vol. 1, 1817, 

 p. 67, pi. 4, fig. 5, female (type-locality, inhabits the common oyster; 

 type not extant). DE KAY, Nat. Hist. New York, pt. 6, Crust., 1844, 

 p. 12, pi. 7, fig. 16, female. SMITH, Rept. U. S. Commr. of Fish and 

 Fisheries, pt. 1, for 1871-72 (1873), p. 546 [252] ; not pi. 1, fig. 2, male. 



f Pinnotheres crassipcs DESBONNE, in Desbonne and Schramm, Crust. Gua- 

 deloupe, pt. 1, 1867, p. 43 (type-locality, Guadeloupe, in Ostrca para- 

 sitica; type probably not extant). 



Diagnosis. First leg of female stoutest, propodus distally wid- 

 ened, dactylus curved, other legs similar to one another, dactyl us^ 

 longer, straighter than in first leg. Carapace thin. Palm very wide, 

 just behind distal end. Propodi of all legs in male wide, dactyli 

 longer and more curved than in female. 



Description of female. Surface glabrous for the most part, 

 smooth, shining; carapace subcircular, with the posterior margin 

 very broad; thin, membranaceous, yielding to the touch, convex 

 from before backward, gastro-cardiac area separated by broad de- 

 pressions from the branchio-hepatic area ; lateral margins thick and 

 bluntly rounded; front about one-seventh as wide as carapace, trun- 

 cate and scarcely advanced in dorsal view, its margin deflexed and 



